The Cannon is the most unique piece in Xiangqi (象棋, Cờ Tướng), moving like a Chariot but capturing only by jumping a screen. Master cannon tactics: screens, discovered attacks, batteries, and deadly checkmates against the palace.
No piece defines Xiangqi (象棋) more than the Cannon. It has no equivalent in Western chess, and mastering it is the fastest way to feel truly at home in Cờ Tướng. The Cannon slides like a Chariot along ranks and files when moving to an empty square, but to capture it must leap over exactly one intervening piece, its screen, and land on an enemy. This single rule generates a whole universe of tactics that reward players who understand it deeply. This guide will make you a Cannon expert.
Because the Cannon needs a screen to capture, it is strongest when the board is full and grows subtler as pieces come off. Early on it delivers long-range threats over crowded ranks; later it demands careful arrangement of screens to stay dangerous. Understanding this life cycle, when to strike with the Cannon and when to reposition it, is central to strong Xiangqi play.
The Fundamentals of the Screen
Everything about the Cannon flows from the screen. To capture, there must be exactly one piece, yours or the opponent's, between the Cannon and its target. Zero screens and the Cannon can only move, not capture; two or more and the line is blocked. This means a Cannon can threaten a piece only when a single screen sits on the line, and clever players constantly manipulate screens to switch threats on and off.
A vital consequence is that you can defuse a Cannon by removing its screen or by adding a second one. If an enemy Cannon threatens your Chariot, interposing a second piece on the line renders the Cannon harmless, now there are two screens. Conversely, you activate your own Cannon by supplying a screen: pushing a Soldier onto the line, or using the enemy's own piece as an involuntary screen. Thinking in terms of screens, not just lines, is the first step to Cannon mastery.
Discovered Attacks and Cannon Batteries
The Cannon's greatest tactical gift is the discovered attack. Line your Cannon behind one of your own pieces, aimed at the enemy General, and that front piece becomes a loaded screen. When you move it, the Cannon suddenly delivers check, while the moving piece makes its own threat. Because the opponent cannot answer two threats at once, discovered attacks with the Cannon win material again and again.
Cannon batteries, two Cannons stacked on a file, or a Cannon paired with a Chariot, amplify this power. A Cannon behind a Chariot on an open file creates constant threats: the Chariot attacks directly while the Cannon lurks for a discovery. Against the palace, a Cannon on the central file using an Advisor as a forced screen is a recurring mating tool. Learn to build these batteries, and your attacks will carry a second, hidden layer of danger.
Cannon Checkmating Patterns
Several classic checkmates rely on the Cannon, and every serious player memorizes them. The most famous is the Cannon behind a screen delivering check to a General with no escape, while a Horse or Soldier covers the flight squares. Because the Cannon strikes from a distance over a screen, the General often cannot simply capture or block it, especially when its own Advisor is the very screen enabling the check.
Another deadly pattern is the Cannon and Horse mate: the Horse delivers an unblockable check while the Cannon, over a screen, controls the escape square. A third is the empty-throne motif, where clearing a screen lets a Cannon check the General along a file the defender assumed was safe. Study these patterns until you recognize them instantly; in real games you will steer positions toward the shapes you know, and the Cannon will supply the finishing blow.
Managing the Cannon Across the Game
Because the Cannon depends on screens, its value shifts as the game develops. In the opening and middlegame, with the board crowded, the Cannon is a fearsome long-range attacker, this is when the Central Cannon opening puts immediate pressure on the enemy. As pieces are traded, screens grow scarce, and a Cannon can become awkward, so plan ahead: keep a Soldier or Elephant available to serve as a screen, or reposition the Cannon before the board empties.
In the endgame, a Cannon without reliable screens loses much of its sting, and a lone Cannon cannot easily force mate. Knowing when your Cannon is peaking, and when to cash it in for a favorable trade, is a subtle but game-deciding skill. On XiangqiPlay, replay master games and pay attention to how the strongest players nurture their Cannons, feeding them screens in the middlegame and converting them wisely as the position simplifies. Master the Cannon, and you master the soul of Cờ Tướng.